1. Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstraße 5-13, 81377 Munich, Germany
2. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
3. Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Computer-Chemie-Centrum, Nägelsbachstraße 25, 91052 Erlangen, Germany